The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 21, 1988
Filed:
Jun. 09, 1986
Applicant:
Inventors:
Kaoru Yamazaki, Akikawa, JP;
Shiro Iwakura, Tokyo, JP;
Masatoshi Kunii, Iruma, JP;
Toshihiro Hayashi, Kunitachi, JP;
Yoshio Sakamoto, Hachioji, JP;
Assignee:
Kabushiki Kaisha Kenwood, , JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H04R / ; H04R / ;
U.S. Cl.
CPC ...
381193 ; 381194 ; 381199 ; 381201 ;
Abstract
In an electroacoustic converter, center pole and top plate which constitute a magnetic circuit are mechanically abutted against each other by interposing an air gap defining member therebetween. The air gap defining member is a projection provided on the center pole or top plate, otherwise non-magnetic ring-like sleeve covered on the center pole or top plate. An air gap in the magnetic circuit can be precisely defined by the air gap defining member without using any alignment tool in its assemble process.